Improved gas-pipe and stair-rod



PATENT OFFICE. a

MITGH'EL GOULD, or NEWARK, N'n'vvfJ-nnsn-Y.

IMPRovl-:D GAS-PIRE ANDv NMR-Ron.

i Specification forming part of Letters Patent No. 43,45", dated uly l2, 1864.

To all whom t may concern/.-

Be it known that I, Ml'rorInL GoULD, of Newark, in thecounty of Essex and State of New Jersey, have invented a new and useful Improvement injthc Manufacture of Grasv Pipes; and 'l do hereby declare that the folf lowing is full, clear, and exact description "thereof, which will enable others skilled in the art to make and use the same, reference leing had to theaecompanying drawings,

' making a part. of thisspeciiication, in which- Figure 1 is an end. sectional elevation ofmy -invention-prior tobrazing; Fig. 2, a side sectional .elevation of the same prior to brazlng sheet is generallyl made of iron', 'andthe outer y tube or sheet of" Somev softer and finer or more ornamental metal. In thepre'sent example of my improvement the outer or enveloping tubeis composed Iof brass; but I do not coniinemy self to the use oi' any particular kind of metal for either of the tubes.

The usual method of manufacturing these double tubes is first to draw out theinn'er iron tube and weld it, then draw and braze the brass or enveloping tubefto a size just large enough topass over the'iron tube, and then insert the iron tube within the enveloping tube. This is a comparatively slow and eX-I pensive mothod.

`In carrying out my improvement I take two propose to `user-say one of iron and one of than. the innerfsheet, and the two sheets are now-drawn out (by any ofthe common rolling or drawing devices that are suitable) into the softer or enveloping metal is drawn more than' the inner metal,and the edges of the enveloping metal' are turned or lappedovertheledgeslof'the metal comprising the inner tube, asshown iii-Figs. 1, 2, 3.

shown in said figures. The seam or opening` veloping metal at the seam, after which the tube is drawn through a die-plate of smaller diameter; by which drawing the two meta-ls and strong tube is produced, as shownin Figs. 4 5, and 6. f The tubes Ithus made may-be' employed for conducting gas, or for any other desired pur pose to which they are suited.

I do not claim,- broa-dly, the simultaneous drawing of two metals into tubular form 5 l but,

i;lavin g thus described my invention, I 'claini ns1-new and desire to secure by Letters Patent, as'an improved article of manufaoture-' AV tubeconstructed in the manner substan. tially` as herein .shown and described. i f

MITCHEL GOULD.

A Witnesses J As. P. HALL, M. M.- Livmssgron.

sheetsfone ofeach) of the two metals thatl I I brassL'''fThe outer sheetis cut a little wider tubular form,'-during which drawing process kjrepr'e'sents'theinner sheet or tubeof iron v `B,`the outer or.' enveloping ,sheet or tube of 'brass,.nd lfb the 'edges thereof 'turn'eoven 'the edges'of the inner tube into the position v ain' the tube thus drawn is now closed loy soldering or brazin-g the two edges of the enare condensed, solidified, and compressed more firmly together, and a smooth, iinished, 

